Gristina and an unnamed person, reported to be Baker, were listed as co-defendants in an indictment issued Friday by the New York City District Attorney's Office.

Authorities arrested Gristina Feb. 22 while she was meeting with a Morgan Stanley banker to discuss ways to expand her alleged business online. A spokesperson for Morgan Stanley declined to comment on the case.

Gristina has pleaded not guilty, saying through her lawyer that she was attempting to set up an online dating business. At a hearing Tuesday, a judge refused to lower the British-born Gristina's bail, calling her a flight risk. She was sent back to Rikers Island jail.

The Millionaire Madam allegedly promoted prostitution under the name Anna Scotland for 15 years, netting her millions of dollars as attractive young women, some of them allegedly underage, and wealthy men came and went from an unassuming brownstone on Manhattan's Upper East Side.

"I'm surprised there was a brothel next door," Tony Kim, who owns Danny Boy's Cleaners, told ABCNews.com. "I've never seen anything like people walking in and out during the day."

Gristina was allegedly caught on wiretaps and surveillance videos as part of a five-year investigation by the District Attorney's Public Corruption Unit, which probes the conduct of law enforcement and other officials and whether they have been protecting Gristina's alleged activities.

Prosecutors alleged at her arraignment that the tapes capture her bragging about how law enforcement sources promised to warn her if she were under suspicion, particularly during the time New York Gov. Eliot Spitzer was revealed to be a client of an escort service that was shut down in 2009.

She was also heard on wiretaps talking about a friend who is a prominent lawyer and the precautions he helped her take in the event of her arrest, according to prosecutors.

"He [the friend] basically locked money away for her should this ever happen so she will have money when she comes out of it," Assistant District Attorney Charles Linehan said, according to a transcript of the Feb. 23 arraignment obtained by DNAinfo.

Gristina reportedly has four children and lives in Monroe, N.Y., with husband Kelvin Gorr and various rescue animals.

"We are just a great family ... and my wife means everything to me," Gorr told the New York Daily News as he exited his wife's hearing today. "I feel heartbroken."

Gristina was previously married to Dario Gristina, who is a candidate for New York State Assembly.